Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • Let a , b and c be vectors with magnitude 3 , 4 , and 5 respectively and a+b+c=0 then the value of

Let a , b and c be vectors with magnitude 3 , 4 , and 5 respectively and a+b+c=0 then the value of

Answers (1)

best_answer

Solution:

\ecause a+b+c=0

Squaring both  the sides

left | a+b+c ight |=0\ \Rightarrow left | a ight |^2+left | b ight |^2+left | c ight |^2+2(acdot b+bcdot c+ccdot a)=0\ \Rightarrow 9+16+25+2(acdot b+bcdot c+ccdot a)=0\ \Rightarrow 2(acdot b+bcdot c+ccdot a)=-50\ \Rightarrow (acdot b+bcdot c+ccdot a)=-25

Posted by

Deependra Verma

View full answer

Similar Questions

Latest Question